Threading machine for the connection of deformed reinforcing bars
a technology of reinforcing bars and threaded fasteners, which is applied in the direction of threaded fasteners, bolts, manufacturing tools, etc., can solve the problems of complicated dealing with machines and difficulty, and achieve the effect of convenient maintenance and repair
Inactive Publication Date: 2010-05-06
DEXTRA ASIA CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
"The present invention provides a threading machine that can handle long work pieces with irregular outer shape. The machine has two degrees of freedom that allow for surface preparation and threading without compromising the concentricity of the thread. The machine is simple and easy to maintain and repair. The invention is particularly useful for machining reinforcing bars used for reinforcement of concrete."
Problems solved by technology
Such bars present ribs in both the radial and longitudinal directions that make them difficult to machine.
These ribs are a hurdle to the machining of these bars, and dealing with them is complicated by the fact that they vary a lot in shape and dimensions from steel mill to another, from one bar lot to another, and even along bars from the same production lot.
Method used
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Embodiment Construction
[0023]The present invention is better understood by the preferred embodiments according to the invention in reference to the drawing as follows.
[0024]FIG. 9a shows a typical deformed bar for concrete reinforcement that the object of the invention is made to work. Such bars (3) are constituted by a core (4) that is approximately cylindrical and by ribs (6) and nodes (7) formed on an outer peripheral face thereof at variable intervals.
[0025]FIGS. 9b and 9c respectively show the result of the peeling operation and threading operation performed by the invention. The ribs (6) and the nodes (7) are generally removed by the peeling operation. However if the core (4) of the bar is not perfectly cylindrical, the ribs (6) and nodes (7) may be only partially removed, and a small part thereof may remain on said core (4) after the peeling operation the bar end (8) is cylindrical and the face (9) may be chamfered. The thread portion (10) is then formed by cutting or rolling on the outer periphera...
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Abstract
A threading machine for the end threading of long metal bars includes a peeler and a threader mounted co-axially on a spindle. The spindle is powered by a motor. A leading rod is attached to the clamping chariot. The leading rod includes the peeler opening and closing controller, and the threader opening and closing controller. The controllers are supported by a carriage set, and the threader is able to travel forward and backward. The peeler opening controller and threader opening controller are adjustable by moving them along leading rod to accommodate various thread length.
Description
CROSS-REFERENCE TO RELATED U.S. APPLICATIONS[0001]Not applicable.[0002]STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0003]Not applicable.NAMES OF PARTIES TO A JOINT RESEARCH AGREEMENT Not applicable.REFERENCE TO AN APPENDIX SUBMITTED ON COMPACT DISC Not applicable.BACKGROUND OF THE INVENTION[0004]1. Field of the Invention[0005]This invention relates to the threading machine for the end threading of long metal bars or tubes, and in particular to the external threading of bars hat are not perfectly circular in shape.[0006]2. Description of Related Art Including Information Disclosed Under 37 CFR 1.97 and 37 CFR 1.98.[0007]The first method used to machine bars of irregular outer shape has been to first render them circular, either by grinding the ribs out (FIG. 1a), or by machining the ribs out or else by pressing the ribs to flatten them such as the system known under EP0947642 FIG. (1c). Once it has been rendered more or less circular, the bars can then be threaded ...
Claims
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IPC IPC(8): B23G1/52B23G1/04
CPCB21H3/04B23B5/12B23B2215/68B23G1/04B23P23/02B23P23/04E04C5/165Y10T408/38Y10T408/5633Y10T408/3833
Inventor BRAUN, JEAN-JACQUES
Owner DEXTRA ASIA CO LTD